Space shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies over the Hudson River prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Mario Tama/Getty Images)

Riding atop a 747 shuttle carrier aircraft, the space shuttle Enterprise flies over New York City on April 27, 2012 in New York City. (Photo by Bruce Bennett/Getty Images)

Space Shuttle Enterprise Arrives In New York Atop A 747

People watch as the space shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past the Jersey City skyline prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Michael Heiman/Getty Images)

Space shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies over the Hudson River prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Mario Tama/Getty Images)

People watch as the space shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past the Jersey City skyline prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Michael Heiman/Getty Images)

Space shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past the Statue of Liberty prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Michael Heiman/Getty Images)

NASA's 747 Shuttle Carrier Aircraft (SCA) with space shuttle Enterprise mounted atop flies up the Hudson River past the New York City skyline April 27, 2012 on its way to John F. Kennedy International Airport. (Photo credit: TIMOTHY A. CLARY/AFP/GettyImages)

Space Shuttle Enterprise Arrives In New York Atop A 747

The space shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past Manhattan prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Preston Rescigno/Getty Images)

Space Shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past the Verrazano-Narrows Bridge prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Carl Erwich/Getty Images)

Space Shuttle Enterprise Arrives In New York Atop A 747

Space Shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past the Jersey City prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Carl Erwich/Getty Images)

Space Shuttle Enterprise Arrives In New York Atop A 747

Space Shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past the Statue of Liberty prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Michael Heiman/Getty Images)

Space Shuttle Enterprise Arrives In New York Atop A 747

Space Shuttle Enterprise, mounted atop a 747 shuttle carrier aircraft, flies past the Statue of Liberty prior to landing at John F. Kennedy International Airport on April 27, 2012 in New York City. (Photo by Michael Heiman/Getty Images)

Space Shuttle Enterprise Takes Off From Washington Dulles International Airport

Space Shuttle Enterprise takes off from Washington Dulles International Airport on route to New York City on Friday, April 27, 2012 (credit: WUSA/WJLA)

Space Shuttle Enterprise Departs Washington DC For New York Atop 747

People watch as the space shuttle Enterprise, sitting atop a NASA 747 shuttle carrier aircraft, takes off from Washington Dulles International Airport, on April 27, 2012 in Dulles, Virginia. (Photo by Mark Wilson/Getty Images)

Space Shuttle Enterprise Departs Washington DC For New York Atop 747

People watch as the space shuttle Enterprise, sitting atop a NASA 747 shuttle carrier aircraft, takes off from Washington Dulles International Airport, on April 27, 2012 in Dulles, Virginia. (Photo by Mark Wilson/Getty Images)

Space Shuttle Enterprise Departs Washington DC For New York Atop 747

Young boys watch as the space shuttle Enterprise sitting atop a NASA 747 shuttle carrier aircraft prepares to take off from Washington Dulles International Airport, on April 27, 2012 in Dulles, Virginia. (Photo by Mark Wilson/Getty Images)

Space Shuttle Enterprise

The space shuttle Enterprise is seen mated on top of the NASA 747 Shuttle Carrier Aircraft (SCA) at Washington Dulles International Airport, Friday, April 20, 2012, in Sterling, Va. (Photo Credit: NASA/Bill Ingalls)